Date Code 20100129
Instruction Manual
SEL-751A Relay
Section 5
Metering and Monitoring
Overview
The SEL-751A Feeder Protection Relay includes metering functions to
display the present values of current, voltage (if included), analog inputs (if
included), and RTD measurements (with the external SEL-2600 RTD Module
or an internal RTD card). The relay provides the following methods to read the
present meter values:
➤
Front-panel rotating display
➤
Front-panel menu
➤
EIA-232 serial ports (using SEL ASCII text commands or
AC
SEL
ERATOR
QuickSet
®
SEL-5030 Software)
➤
Telnet via Ethernet port
➤
Modbus
®
via EIA-485 port or EIA-232 port
➤
Modbus
TCP via Ethernet port
➤
DNP3 Serial via EIA-232 port or EIA-485 port
➤
DNP3 LAN/WAN via Ethernet port
➤
DeviceNet port
➤
Analog outputs
➤
IEC 61850 via Ethernet port
➤
C37.118 Synchrophasor Protocol via serial port
Feeder load monitoring and trending are possible using the Load Profile
function. The relay automatically configures itself to save up to 17 quantities
(selected from the Analog Quantities) every 5, 10, 15, 30, or 60 minutes. The
data are stored in nonvolatile memory. As many as 4000 time samples are
stored.
Station DC Battery Monitor is available as an option in the SEL-751A relay.
Refer to
Station DC Battery Monitor on page 5.11
for description and
application details.
The Breaker Monitor feature is available in all SEL-751A relays. Refer to
for description and application details.
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